CN110988689B

CN110988689B - Recovery method, device and system for recoverable attenuation capacity of battery

Info

Publication number: CN110988689B
Application number: CN201910338265.5A
Authority: CN
Inventors: 汤慎之; 杜明树; 李世超; 阮见
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Ningde Shidai Runzhi Software Technology Co ltd
Priority date: 2019-04-25
Filing date: 2019-04-25
Publication date: 2021-05-25
Anticipated expiration: 2039-04-25
Also published as: US20200341073A1; JP2022529545A; KR20220015294A; CN110988689A; EP3731324A1; JP7481273B2; US11486934B2; WO2020216079A1

Abstract

The disclosure relates to a method, a device and a system for recovering recoverable attenuation capacity of a battery. The method comprises the following steps: determining a recoverable fade capacity of the battery; determining a corresponding battery parameter lower limit according to the recoverable attenuation capacity of the battery; and instructing the discharging device to discharge the battery to the corresponding battery parameter lower limit. The method can recover the recoverable capacity attenuation generated by part of the electric core system, so that the electric core can exert the optimal performance.

Description

Recovery method, device and system for recoverable attenuation capacity of battery

Technical Field

The present disclosure relates to the field of batteries, and in particular, to a method, an apparatus, and a system for recovering recoverable attenuation capacity of a battery.

Background

The accurate estimation of the maximum available capacity of the battery pack has important significance for estimating the residual capacity, the residual energy and the like, and is also an important parameter for reflecting the aging state of the battery cell. In general, capacity fade corresponds to irreversible damage within the cell and cannot be recovered without destroying the cell structure.

Disclosure of Invention

The applicant found that: there are two partial capacity fade for part of the electrical core system: unrecoverable volume fade and recoverable volume fade (similar to a memory effect). The recoverable capacity fade referred to herein is a property of the cell itself, which is different from the recoverable capacity fade of Pack (battery Pack) due to inconsistency between cells. The unrecoverable capacity attenuation caused by the real aging of the battery cell reflects the real aging of the battery cell, but the recoverable capacity attenuation reduces the actual available capacity of the battery cell and cannot exert the optimal performance of the battery cell.

In view of the above technical problems, the present disclosure provides a method, an apparatus, and a system for recovering recoverable attenuation capacity of a battery, which can recover recoverable capacity attenuation generated by a part of a battery core system, so that the battery core can exert optimal performance.

According to an aspect of the present disclosure, there is provided a method of recovering a recoverable fade capacity of a battery, including:

determining a recoverable fade capacity of the battery;

determining a corresponding battery parameter lower limit according to the recoverable attenuation capacity of the battery;

and instructing the discharging device to discharge the battery to the corresponding battery parameter lower limit so as to improve the maximum available capacity of the battery.

In some embodiments of the present disclosure, the battery is a battery pack or a single cell.

In some embodiments of the present disclosure, the battery parameter lower limit is a battery state of charge lower limit or a voltage lower limit.

In some embodiments of the present disclosure, the instructing the discharging device to discharge the battery to the respective battery parameter lower limit comprises:

judging whether the recoverable attenuation capacity of the battery is larger than a preset recoverable threshold value or not;

and in the case that the recoverable attenuation capacity of the battery is greater than a predetermined recoverable threshold, instructing the discharging device to discharge the battery to a corresponding battery parameter lower limit.

and transmitting the corresponding battery parameter lower limit to a vehicle controller so that the vehicle controller displays the corresponding battery parameter lower limit to a user at a vehicle end and prompts the user to discharge the battery to the corresponding battery parameter lower limit.

setting the electrical equipment to a maintenance mode at a predetermined time period or a time period for determining a recoverable attenuation capacity of the battery;

in the maintenance mode, the external discharge device is instructed to discharge the battery to the corresponding battery parameter lower limit.

judging whether the initial battery charge state under the charging condition is in the dischargeable battery charge state range or not;

instructing the discharging device to discharge the battery to the corresponding battery parameter lower limit under the condition that the initial battery state of charge is within the dischargeable battery state of charge range

judging whether a specific battery cell exists in the battery pack, wherein the specific battery cell is a battery cell with recoverable attenuation capacity larger than a preset recoverable threshold value;

judging whether the battery charge state of the specific battery cell is in the dischargeable battery charge state range or not under the condition that the specific battery cell exists in the battery pack;

and under the condition that the battery state of charge of the specific battery cell is in the dischargeable battery state of charge range, calculating the time required for discharging the specific battery cell to the corresponding battery parameter lower limit, and indicating the discharging device to discharge the specific battery cell to the corresponding battery parameter lower limit.

In some embodiments of the present disclosure, the instructing the discharging device to discharge the battery to the respective battery parameter lower limit further comprises:

and in the case that the battery pack starts to be charged and the battery state of charge of the specific battery cell is not in the dischargeable battery state of charge range, instructing the discharging device to stop the operation of discharging the specific battery cell to the lower limit of the corresponding battery parameter.

In some embodiments of the present disclosure, the range of dischargeable battery states of charge is less than a predetermined battery state of charge threshold without fully recovering the recoverable fade capacity.

In some embodiments of the present disclosure, the method for recovering a recoverable attenuation capacity of a battery further includes: instructing the charging device to charge the battery.

In some embodiments of the disclosure, the determining the recoverable attenuation capacity of the battery comprises:

and determining the recoverable attenuation capacity of the battery by adopting a historical working condition method or an online estimation method.

In some embodiments of the disclosure, the determining the recoverable attenuation capacity of the battery by using the historical operating condition method includes:

statistically determining two-dimensional histograms of different battery charge state use intervals and current multiplying powers after last capacity recovery;

and performing accumulation calculation through experimental statistical data to obtain the recoverable attenuation capacity of the battery.

In some embodiments of the present disclosure, the determining the respective battery parameter lower limit according to the recoverable attenuation capacity of the battery comprises:

and determining the lower limit of the corresponding battery parameter according to the generation process of the recoverable attenuation capacity and the current-voltage relation.

In some embodiments of the present disclosure, the generating process of the recoverable attenuated capacity is a battery state of charge cycle interval and time that generates the recoverable capacity.

In some embodiments of the present disclosure, the current-voltage relationship is a voltage variation curve or a voltage capacity differential variation curve of a constant current condition.

According to another aspect of the present disclosure, there is provided a recovery apparatus by which a battery can recover a fading capacity, including:

a recoverable capacity determination module for determining a recoverable attenuation capacity of the battery;

the lower limit parameter determining module is used for determining the lower limit of the corresponding battery parameter according to the recoverable attenuation capacity of the battery;

and the discharge control module is used for indicating the discharge device to discharge the battery to the corresponding battery parameter lower limit so as to improve the maximum available capacity of the battery.

In some embodiments of the present disclosure, the apparatus for recovering recoverable attenuation capacity of a battery is configured to perform operations for implementing the method for recovering recoverable attenuation capacity of a battery according to any of the embodiments described above.

a memory to store instructions;

a processor configured to execute the instructions to cause the apparatus for recovering recoverable attenuation capacity of a battery to perform operations that implement the method for recovering recoverable attenuation capacity of a battery as described in any of the above embodiments.

According to another aspect of the present disclosure, there is provided a battery management system including a recovery apparatus that can recover a fading capacity of a battery according to any of the above embodiments.

According to another aspect of the present disclosure, there is provided a battery restorable attenuation capacity recovery system, including a battery restorable attenuation capacity recovery apparatus according to any of the above embodiments, or including a battery management system according to any of the above embodiments.

The method can recover the recoverable capacity attenuation generated by part of the electric core system, so that the electric core can exert the optimal performance.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic diagram of some embodiments of a method for recovering recoverable fade capacity of a battery according to the present disclosure.

Fig. 2a is a schematic diagram of some embodiments of a recovery apparatus for recovering a fading capacity of a battery according to the present disclosure.

Fig. 2b is a schematic diagram of some further embodiments of the disclosed recovery apparatus for recovering a fading capacity of a battery.

Fig. 3 is a schematic diagram of another embodiment of a recovery apparatus for recovering a fading capacity of a battery according to the present disclosure.

Fig. 4 is a schematic diagram of some embodiments of a battery management system of the present disclosure.

Fig. 5 is a schematic diagram of some embodiments of a recovery system for recoverable attenuation capacity of a battery according to the present disclosure.

Fig. 6 is a schematic diagram of other embodiments of a recovery system for recoverable attenuation capacity of a battery according to the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.

Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

The applicant found that: the non-recoverable capacity attenuation and the recoverable capacity attenuation exist in the charging and discharging process of part of the electric core system; the unrecoverable capacity attenuation is the capacity unavailability caused by the aging of the battery cell, while the recoverable capacity attenuation is the capacity which can be released again by the battery cell after some regulation in the circulation process, and the capacity cannot reflect the aging state of the battery cell; when the current available capacity of the battery cell is tested, the actual aging condition of the current battery cell may be overestimated due to the recoverable capacity attenuation.

Based on the above, the present disclosure provides a method, an apparatus, and a system for recovering recoverable attenuation capacity of a battery, and a battery management system, which can recover recoverable capacity attenuation generated by a part of a battery core system, so that the battery core can exert optimal performance.

Fig. 1 is a schematic diagram of some embodiments of a method for recovering recoverable fade capacity of a battery according to the present disclosure. Preferably, the present embodiment may be performed by a recovery apparatus that can recover the fade capacity of the battery of the present disclosure. The method comprises the following steps:

step 11, determining the recoverable attenuation capacity of the battery.

In some embodiments of the present disclosure, the battery may be a battery pack or a single cell.

In some embodiments of the present disclosure, one battery pack may include a plurality of cells.

In some embodiments of the present disclosure, step 11 may comprise: and determining the recoverable attenuation capacity of the battery by adopting a historical working condition method or an online estimation method.

In some embodiments of the present disclosure, the determining the recoverable attenuation capacity of the battery by using the historical operating condition method may include: statistically determining two-dimensional histograms of different battery charge state use intervals and current multiplying powers after last capacity recovery; and performing accumulation calculation through experimental statistical data to obtain the recoverable attenuation capacity of the battery.

In some embodiments of the present disclosure, the determining the recoverable attenuation capacity of the battery by using the historical operating condition method may include: recording the SOC (State of Charge, battery State of Charge, also called residual capacity) of the battery pack before each charging and the SOC after charging, counting the cycle number and temperature in different SOC use intervals, and determining the size of the recoverable capacity attenuation amount by looking up a table.

In some embodiments of the present disclosure, the determining the recoverable attenuation capacity of the battery by using the historical operating condition method may include: calibrating the magnitude of the attenuation quantity of the recoverable capacity of each circle in different SOC use intervals according to the recoverable attenuation capacity determined by different cycle numbers and temperatures calibrated under the line, or fitting the attenuation quantity of each circle in different SOC use intervals through a polynomial and other functions (note that the attenuation quantity of each cycle can be a positive value and a negative value); and accumulating the recoverable capacity attenuation amount according to the SOC interval of the discharging working condition before each charging.

In some embodiments of the present disclosure, the determining the recoverable attenuation capacity of the battery using the online estimation method may include: calculating the recoverable attenuation capacity of the battery according to the current-voltage relationship, for example: and calculating the recoverable attenuation capacity of the battery according to the voltage change curve or the voltage capacity differential change curve under the constant current condition.

In some embodiments of the present disclosure, the determining the recoverable attenuation capacity of the battery using the online estimation method may include: analyzing a voltage capacity differential change curve of the battery under the line to determine the offset of a specific peak and the variation of the peak height; and acquiring recoverable attenuation capacity on line according to the corresponding relation.

And step 12, determining the lower limit of the corresponding battery parameter according to the recoverable attenuation capacity of the battery.

In some embodiments of the present disclosure, the battery parameter lower limit may be a battery state of charge lower limit (SOC lower limit) or a voltage lower limit.

In some embodiments of the present disclosure, step 12 may comprise: and determining the lower limit of the corresponding battery parameter according to the generation process of the recoverable attenuation capacity and the current-voltage relation.

In some embodiments of the present disclosure, the generating process of the recoverable attenuated capacity may be a battery state of charge cycle interval and time that generates the recoverable capacity.

In some embodiments of the present disclosure, the current-voltage relationship may be a voltage variation curve or a voltage capacity differential variation curve of a constant current condition.

In some embodiments of the present disclosure, step 12 may comprise: analyzing a voltage capacity differential change curve of the battery core offline, and determining that the offset of a specific peak and the variation of the peak height have a corresponding relation with a specific SOC lower limit; and acquiring a specific SOC lower limit on the line according to the corresponding relation.

In some embodiments of the present disclosure, the corresponding lower SOC limit or lower voltage limit in step 12 may be obtained by way of offline calibration or by way of online calculation.

In some embodiments of the present disclosure, step 12 may comprise: and obtaining corresponding SOC lower limits or voltage lower limits required for recovering different percentages corresponding to the recoverable capacity generated in different modes.

In some embodiments of the present disclosure, step 12 may comprise: and judging whether the online estimated recoverable capacity is larger than a threshold value or not, so that the use of electric equipment such as vehicles and the like provided with batteries is influenced. When the use of an electric device such as a vehicle, which is equipped with a battery, is affected, a specific SOC lower limit or a voltage lower limit required for recovering the capacity is calculated from the relationship between the mode of generating the recoverable capacity and the current voltage.

And 13, instructing the discharging device to discharge the battery to the corresponding battery parameter lower limit so as to improve the maximum available capacity of the battery.

In some embodiments of the present disclosure, step 13 may comprise: judging whether the recoverable attenuation capacity of the battery is larger than a preset recoverable threshold value or not; and in the case that the recoverable attenuation capacity of the battery is greater than a predetermined recoverable threshold, instructing the discharging device to discharge the battery to a corresponding battery parameter lower limit.

In some embodiments of the present disclosure, the predetermined recoverable threshold may be 3% of the nominal capacity.

In some embodiments of the present disclosure, step 13 may comprise: and indicating the discharging device to discharge the battery to the corresponding battery parameter lower limit by adopting a user reminding method, a charging control method, a regular maintenance method, an equalizing method and the like.

In some embodiments of the present disclosure, after step 13, the method for recovering recoverable attenuation capacity of a battery may further include: and instructing the charging device to charge the battery to show the increase of the maximum available capacity of the battery.

The following describes the steps of discharging the battery to the lower limit of the corresponding battery parameter in the four different ways.

Firstly, reminding a user of a method.

In some embodiments of the present disclosure, alerting the user may include: determining a recoverable fade capacity of the battery; judging whether the recoverable attenuation capacity of the battery is larger than a preset recoverable threshold value or not; and transmitting the corresponding battery parameter lower limit to a Vehicle controller (such as a VCU (Vehicle Control Unit)) under the condition that the recoverable attenuation capacity of the battery is greater than a preset recoverable threshold value, so that the Vehicle controller displays the corresponding battery parameter lower limit to a user at the Vehicle end and prompts the user to discharge the battery to the corresponding battery parameter lower limit.

In other embodiments of the present disclosure, the reminding the user method may include: calculating recoverable attenuation capacity on line; judging whether the recoverable attenuation capacity of the battery is larger than a preset recoverable threshold value or not; and recommending the corresponding lower battery parameter limit to the user through the user interface under the condition that the recoverable attenuation capacity of the battery is larger than a preset recoverable threshold value so as to prompt the vehicle user to discharge to the corresponding lower battery parameter limit (such as a specific lower SOC limit or a specific lower voltage limit) at a proper opportunity.

Second, a charge control method. The method requires that the charging pile has a discharging function.

In some embodiments of the present disclosure, the charge control method may include: judging whether the recoverable attenuation capacity of the battery is larger than a preset recoverable threshold value or not; under the condition that the recoverable attenuation capacity of the battery is larger than a preset recoverable threshold value, judging whether the initial battery charge state under the charging condition is in the charge state range of the dischargeable battery; and under the condition that the initial battery state of charge is in the dischargeable battery state of charge range, instructing the discharging device to discharge the battery to the corresponding battery parameter lower limit.

In other embodiments of the present disclosure, the charge control method may include: calculating recoverable attenuation capacity on line; judging whether the recoverable attenuation capacity of the battery is larger than a preset recoverable threshold value or not; in the case where the recoverable attenuation capacity of the battery is greater than a predetermined recoverable threshold, after gun insertion, it is determined whether the initial SOC during charging is within a dischargeable SOC range because energy is wasted if the initial SOC is too high for discharging. If the conditions are met, a fixed charging process is set so that normal charging is started after discharging to a specific SOC lower limit or voltage lower limit.

And thirdly, a regular maintenance method.

In some embodiments of the present disclosure, the periodic maintenance may include: setting an electrical apparatus (e.g., a vehicle) to a maintenance mode for a predetermined period of time or for a period of time that determines a recoverable fade capacity of a battery; in the maintenance mode, judging whether the recoverable attenuation capacity of the battery is larger than a preset recoverable threshold value; and in the case that the recoverable attenuation capacity of the battery is greater than a predetermined recoverable threshold, instructing an external discharge device to discharge the battery to a corresponding battery parameter lower limit.

And fourthly, balancing. The method is mainly used when only part of the battery cells have recoverable capacity and the whole Pack is not required to be adjusted.

In some embodiments of the present disclosure, the equalization method may include: judging whether a specific battery cell exists in the battery pack, wherein the specific battery cell is a battery cell with recoverable attenuation capacity larger than a preset recoverable threshold value; judging whether the battery charge state of the specific battery cell is in the dischargeable battery charge state range or not under the condition that the specific battery cell exists in the battery pack; under the condition that the battery charge state of the specific battery cell is in the dischargeable battery charge state range, calculating the time required for discharging the specific battery cell to the corresponding battery parameter lower limit, and indicating the discharging device to discharge the specific battery cell to the corresponding battery parameter lower limit; and in the case that the battery pack starts to be charged and the battery state of charge of the specific battery cell is not in the dischargeable battery state of charge range, instructing the discharging device to stop the operation of discharging the specific battery cell to the lower limit of the corresponding battery parameter.

In some embodiments of the present disclosure, the equalization method may include: judging whether a specific battery cell exists in the battery pack, wherein the specific battery cell is a battery cell with recoverable attenuation capacity larger than a preset recoverable threshold value; in the case where a specific cell is present in the battery pack, it is determined whether or not the specific cell SOC is within a dischargeable SOC range (which cannot fully recover the recoverable attenuation capacity but is lower than a certain preset threshold), because energy is wasted if the initial SOC is too high for discharging; if the conditions are met, calculating the time required by the specific battery cell to be balanced to the specific SOC, and starting balancing, wherein the balancing is an operation of indicating a discharging device to stop discharging the specific battery cell to the lower limit of the corresponding battery parameter; equalization stops after Pack resumes charging SOC rises resulting in SOC not in the dischargeable SOC range.

According to the method for recovering the recoverable attenuation capacity of the battery, which is provided by the embodiment of the disclosure, the recoverable capacity attenuation generated by part of the electric core system can be recovered when the electric core system is discharged to a specific SOC lower limit or a specific voltage lower limit, namely, more capacity can be charged by recharging after the electric core system is discharged to the specific SOC lower limit or the specific voltage lower limit, and the recoverable capacity can be kept for a long time after the recoverable capacity is recovered.

The embodiment of the disclosure can recover the recoverable capacity attenuation generated by part of the electric core system, so that the electric core can exert the best performance.

The second scheme (charge control method) is explained below by way of a specific example.

In some embodiments of the present disclosure, a method for recovering a recoverable fade capacity of a battery based on charge control may include:

step 1, calculating the recoverable capacity on line, wherein the obtained recoverable capacity is 5% of the nominal capacity and is higher than a preset recoverable threshold value, and considering that recovery is needed.

In some embodiments of the disclosure, an example of a specific recoverable capacity calculation method (a historical operating condition method) may include: and counting to obtain two-dimensional histograms of different SOC use intervals and current multiplying power after last capacity recovery, and performing accumulation calculation through offline experimental statistical data to obtain a numerical value of the recoverable capacity.

And 2, calculating to obtain a specific SOC lower limit according to the voltage capacity differential change curve. If the discharge is carried out to 30% SOC, 3% capacity can be recovered, and if the discharge is carried out to 20%, 5% capacity can be recovered. The specific SOC lower limit is set to 20% for complete recovery.

In some embodiments of the present disclosure, the particular lower SOC limit is experimentally derived. However, the specific numerical values are different under different working conditions.

In some embodiments of the present disclosure, a specific method for calculating the specific SOC lower limit may include: and analyzing a voltage capacity differential change curve of the battery cell offline, wherein the offset of a specific peak and the variation of the peak height have a corresponding relation with a specific SOC lower limit, and the specific SOC lower limit is obtained online according to the corresponding relation.

And 3, performing capacity recovery by using a charging control method. At the start of charging, SOC is 25%, and BMS (Battery Management System) issues a discharge command to the charging pile, discharges the charge to 20% first, and then performs normal charging.

Fig. 2a is a schematic diagram of some embodiments of a recovery apparatus for recovering a fading capacity of a battery according to the present disclosure. As shown in fig. 2a, the apparatus for recovering recoverable attenuation capacity of a battery may include a recoverable capacity determination module 21, a parameter lower limit determination module 22, and a discharge control module 23, wherein:

a recoverable capacity determination module 21 for determining a recoverable attenuation capacity of the battery.

In some embodiments of the present disclosure, the recoverable capacity determination module 21 may be configured to determine the recoverable attenuation capacity of the battery using a historical operating condition method or an online estimation method.

In some embodiments of the present disclosure, the recoverable capacity determination module 21 may be configured to statistically determine two-dimensional histograms of different battery state-of-charge usage intervals and current magnifications after the last capacity recovery; and performing accumulation calculation through experimental statistical data to obtain the recoverable attenuation capacity of the battery.

In some embodiments of the present disclosure, the recoverable capacity determining module 21 may be configured to construct a recoverable attenuation capacity estimation model according to historical data, input a current battery parameter into the recoverable attenuation capacity estimation model, and determine a current recoverable attenuation capacity of the battery.

In some embodiments of the present disclosure, the recoverable capacity determining module 21 may be configured to record the SOC of the battery pack before each charging and the SOC after each charging, count the number of cycles and the temperature in different SOC usage intervals, and determine the amount of recoverable capacity attenuation by looking up a table.

In some embodiments of the present disclosure, the recoverable capacity determining module 21 may be configured to calibrate the amount of attenuation of recoverable capacity per cycle in different SOC usage intervals according to recoverable attenuation capacity determined by different numbers of cycles and temperatures calibrated offline, or fit the same through a polynomial and the like function (note that the attenuation per cycle may be a positive value and a negative value); and accumulating the recoverable capacity attenuation amount according to the SOC interval of the discharging working condition before each charging.

In some embodiments of the present disclosure, the recoverable capacity determination module 21 may be configured to calculate the recoverable attenuation capacity of the battery from a current-voltage relationship, such as: and calculating the recoverable attenuation capacity of the battery according to the voltage change curve or the voltage capacity differential change curve under the constant current condition.

In some embodiments of the present disclosure, the recoverable capacity determination module 21 may be configured to perform offline analysis of a voltage capacity differential variation curve of the battery, and determine the shift of a specific peak and the variation of the peak height; acquiring recoverable attenuation capacity of the battery on line according to the corresponding relation

And the parameter lower limit determining module 22 is configured to determine a corresponding battery parameter lower limit according to the recoverable attenuation capacity of the battery.

In some embodiments of the present disclosure, the parameter lower limit determination module 22 may be configured to determine the corresponding battery parameter lower limit according to the generation process of the recoverable attenuation capacity and the current-voltage relationship.

In some embodiments of the present disclosure, the parameter lower limit determining module 22 may be configured to perform offline analysis on a voltage capacity differential change curve of the battery cell, and determine that a corresponding relationship exists between a specific peak offset and a variation of a peak height and a specific SOC lower limit; and acquiring a specific SOC lower limit on the line according to the corresponding relation.

In some embodiments of the present disclosure, the corresponding lower SOC limit or lower voltage limit may be obtained by way of offline calibration or by way of online calculation.

In some embodiments of the present disclosure, the parameter lower limit determining module 22 may be configured to obtain corresponding SOC lower limits or voltage lower limits required for recovering different percentages corresponding to recoverable capacities generated in different manners.

In some embodiments of the present disclosure, the parameter lower limit determination module 22 may be configured to determine whether the online predicted recoverable capacity is greater than a threshold value, which may affect the use of an electrical device such as a vehicle that is equipped with a battery. When the use of an electric device such as a vehicle, which is equipped with a battery, is affected, a specific SOC lower limit or a voltage lower limit required for recovering the capacity is calculated from the relationship between the mode of generating the recoverable capacity and the current voltage.

And the discharge control module 23 is used for instructing the discharge device to discharge the battery to a corresponding battery parameter lower limit so as to improve the maximum available capacity of the battery.

In some embodiments of the present disclosure, the discharge control module 23 may be configured to determine whether a recoverable attenuation capacity of the battery is greater than a predetermined recoverable threshold; and in the case that the recoverable attenuation capacity of the battery is greater than a predetermined recoverable threshold, instructing the discharging device to discharge the battery to a corresponding battery parameter lower limit.

In some embodiments of the present disclosure, the discharge control module 23 may be configured to instruct the discharge device to discharge the battery to the corresponding battery parameter lower limit under different battery operating conditions by using the corresponding control strategy.

In some embodiments of the present disclosure, the discharge control module 23 may be configured to instruct the discharge device to discharge the battery to the corresponding battery parameter lower limit by using a user reminding method, a charge control method, a periodic maintenance method, an equalization method, or the like.

In some embodiments of the present disclosure, the discharge control module 23 may be configured to determine whether a recoverable attenuation capacity of the battery is greater than a predetermined recoverable threshold; and under the condition that the recoverable attenuation capacity of the battery is larger than a preset recoverable threshold value, transmitting the corresponding battery parameter lower limit to a vehicle controller, so that the vehicle controller displays the corresponding battery parameter lower limit to a user at a vehicle end, and prompting the user to discharge the battery to the corresponding battery parameter lower limit.

In some embodiments of the present disclosure, the discharge control module 23 may be configured to determine whether a recoverable attenuation capacity of the battery is greater than a predetermined recoverable threshold; under the condition that the recoverable attenuation capacity of the battery is larger than a preset recoverable threshold value, judging whether the initial battery charge state under the charging condition is in the charge state range of the dischargeable battery; and under the condition that the initial battery state of charge is in the dischargeable battery state of charge range, instructing the discharging device to discharge the battery to the corresponding battery parameter lower limit.

In some embodiments of the present disclosure, the discharge control module 23 may be configured to set the electrical device to a maintenance mode for a predetermined period of time or for a period of time that determines a recoverable fade capacity of the battery; in the maintenance mode, judging whether the recoverable attenuation capacity of the battery is larger than a preset recoverable threshold value; and in the case that the recoverable attenuation capacity of the battery is greater than a predetermined recoverable threshold, instructing an external discharge device to discharge the battery to a corresponding battery parameter lower limit.

In some embodiments of the present disclosure, the discharge control module 23 may be configured to determine whether a specific cell exists in the battery pack, where the specific cell is a cell whose recoverable attenuation capacity is greater than a predetermined recoverable threshold; judging whether the battery charge state of the specific battery cell is in the dischargeable battery charge state range or not under the condition that the specific battery cell exists in the battery pack; and under the condition that the battery state of charge of the specific battery cell is in the dischargeable battery state of charge range, calculating the time required for discharging the specific battery cell to the corresponding battery parameter lower limit, and indicating the discharging device to discharge the specific battery cell to the corresponding battery parameter lower limit.

In some embodiments of the present disclosure, the discharge control module 23 may be further configured to instruct the discharge device to stop discharging the specific cell to the lower limit of the corresponding battery parameter when the battery pack starts to be charged and the battery state of charge of the specific cell is not in the dischargeable battery state of charge range.

Fig. 2b is a schematic diagram of some further embodiments of the disclosed recovery apparatus for recovering a fading capacity of a battery. In contrast to the embodiment of fig. 2a, in fig. 2b, the apparatus for recovering a recoverable attenuation capacity of a battery may comprise a charging control module 24, wherein:

and a charging control module 24 for instructing the charging device to charge the battery to show an increase in the maximum available capacity of the battery.

In some embodiments of the disclosure, the apparatus for recovering recoverable attenuation capacity of a battery is configured to perform operations for implementing the method for recovering recoverable attenuation capacity of a battery according to any of the embodiments (for example, the embodiment of fig. 1) described above.

According to the recovery device for the recoverable attenuation capacity of the battery, which is provided by the embodiment of the disclosure, the recoverable capacity attenuation generated by part of the electric core system can be recovered when the electric core system is discharged to a specific SOC lower limit or a specific voltage lower limit, namely, more capacity can be charged by recharging after the electric core system is discharged to the specific SOC lower limit or the specific voltage lower limit, and the recoverable capacity can be kept for a long time after the recoverable capacity is recovered.

Fig. 3 is a schematic diagram of another embodiment of a recovery apparatus for recovering a fading capacity of a battery according to the present disclosure. As shown in fig. 3, the apparatus for recovering a recoverable attenuation capacity of a battery may include a memory 31 and a processor 32, wherein:

a memory 31 for storing instructions.

A processor 32, configured to execute the instructions, so that the apparatus for recovering recoverable attenuation capacity of a battery performs the operations of implementing the method for recovering recoverable attenuation capacity of a battery according to any of the embodiments (for example, the embodiment of fig. 1) described above.

Fig. 4 is a schematic diagram of some embodiments of a battery management system of the present disclosure. As shown in fig. 4, the battery management system may include a recovery device 41 that can recover the fade capacity from the battery, wherein:

the device 41 for recovering the recoverable attenuation capacity of the battery may be the device for recovering the recoverable attenuation capacity of the battery according to any of the embodiments (for example, the embodiment shown in fig. 2a, fig. 2b or fig. 3) described above.

Based on the battery management system provided by the above-mentioned embodiment of the present disclosure, the recoverable capacity attenuation generated by part of the electric core system can be recovered when discharging to a specific SOC lower limit or voltage lower limit, that is, more capacity can be charged by recharging after discharging to the specific SOC lower limit or voltage lower limit, and the recoverable capacity can be maintained for a long time after recovering.

Fig. 5 is a schematic diagram of some embodiments of a recovery system for recoverable attenuation capacity of a battery according to the present disclosure. As shown in fig. 5, the system for recovering the recoverable attenuation capacity of the battery may include: a recovery device 41, a discharge device 42, and a charging device 43 that can recover the fade capacity, wherein:

the recovering device 41 capable of recovering the attenuation capacity may be a battery recovering device capable of recovering the attenuation capacity as described in any of the above embodiments (for example, the embodiments shown in fig. 2a, fig. 2b or fig. 3).

And the discharging device 42 is used for discharging the battery to the corresponding battery parameter lower limit according to the indication of the recovery device 41 capable of recovering the attenuation capacity.

And the charging device 43 is used for charging the battery according to the indication of the recovery device 41 capable of recovering the attenuation capacity under the condition that the battery is discharged to the lower limit of the corresponding battery parameter so as to improve the maximum available capacity of the battery.

In some embodiments of the present disclosure, the discharging device 42 and the charging device 43 may be integrally provided as a charging and discharging device.

In some embodiments of the present disclosure, the integrally disposed charging and discharging device may be implemented as a charging and discharging device (e.g., a charging post) having a discharging function.

Based on the recovery system of the recoverable attenuation capacity of the battery provided by the above embodiment of the disclosure, the recoverable capacity attenuation generated by part of the electric core system can be recovered when the electric core system is discharged to a specific lower limit of the SOC or a specific lower limit of the voltage, namely, more capacity can be charged after the electric core system is discharged to the specific lower limit of the SOC or the specific lower limit of the voltage and the capacity can be maintained for a long time after the recoverable capacity is recovered.

Fig. 6 is a schematic diagram of other embodiments of a recovery system for recoverable attenuation capacity of a battery according to the present disclosure. As shown in fig. 6, the system for recovering the recoverable attenuation capacity of the battery may include: battery management system 61, discharge device 42 and charging device 43, wherein:

the battery management system 61 may be the battery management system according to any of the embodiments described above (e.g., the embodiment of fig. 4).

The battery recoverable attenuation capacity recovery apparatus described above may be implemented as a general purpose processor, a Programmable Logic Controller (PLC), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any suitable combination thereof, for performing the functions described herein.

Thus far, the present disclosure has been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware to implement the above embodiments, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk, an optical disk, or the like.

The description of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the disclosure in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the disclosure and the practical application, and to enable others of ordinary skill in the art to understand the disclosure for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. A method for recovering recoverable fade capacity of a battery, comprising:

determining a recoverable fade capacity of the battery;

instructing the discharging device to discharge the battery to a corresponding battery parameter lower limit;

wherein the instructing the discharging device to discharge the battery to the corresponding battery parameter lower limit comprises:

instructing the discharging device to discharge the battery to a corresponding battery parameter lower limit in the case that the initial battery state of charge of the battery is below a predetermined threshold;

wherein the determining a corresponding battery parameter lower limit according to the recoverable attenuation capacity of the battery comprises:

determining the lower limit of a corresponding battery parameter according to the generation process and the current-voltage relation of the recoverable attenuation capacity and the percentage of the recoverable attenuation capacity of the battery needing to be recovered, wherein the generation process of the recoverable attenuation capacity is the battery charge state cycle interval and time for generating the recoverable attenuation capacity, and the current-voltage relation is a voltage change curve or a voltage capacity differential change curve under a constant current condition.

2. The method for recovering restorable fading capacity of a battery according to claim 1, wherein said instructing the discharging device to discharge the battery to the corresponding battery parameter lower limit comprises:

3. The method for recovering recoverable attenuation capacity of a battery according to claim 2,

the battery is a battery pack or a single battery cell;

and/or the presence of a gas in the gas,

the lower limit of the battery parameter is a lower limit of the state of charge or a lower limit of the voltage of the battery.

4. The method for recovering restorable fading capacity of a battery according to claim 2, wherein said instructing the discharging means to discharge the battery to the corresponding battery parameter lower limit comprises:

5. The method for recovering restorable fading capacity of a battery according to claim 2, wherein said instructing the discharging means to discharge the battery to the corresponding battery parameter lower limit comprises:

6. The method for recovering restorable fading capacity of a battery according to claim 2, wherein said instructing the discharging means to discharge the battery to the corresponding battery parameter lower limit comprises:

and under the condition that the initial battery state of charge is in the dischargeable battery state of charge range, instructing the discharging device to discharge the battery to the corresponding battery parameter lower limit.

7. The method for recovering restorable fading capacity of a battery according to claim 3, wherein the instructing the discharging device to discharge the battery to the corresponding battery parameter lower limit comprises:

8. The method for recovering restorable fading capacity of a battery according to claim 7, wherein said instructing the discharging means to discharge the battery to the corresponding battery parameter lower limit further comprises:

9. The method for recovering recoverable attenuation capacity of a battery according to any one of claims 6 to 8,

the range of states of charge of the dischargeable battery is less than a predetermined battery state of charge threshold, and the recoverable fade capacity cannot be fully recovered.

10. The method for recovering recoverable attenuation capacity of a battery according to any one of claims 1 to 8,

the method for recovering the recoverable attenuation capacity of the battery further comprises the following steps: instructing a charging device to charge a battery;

and/or the presence of a gas in the gas,

the determining the recoverable attenuation capacity of the battery comprises: and determining the recoverable attenuation capacity of the battery by adopting a historical working condition method or an online estimation method.

11. The method for recovering restorable attenuation capacity of a battery according to claim 10, wherein the determining the restorable attenuation capacity of the battery by using a historical operating condition method comprises:

12. A recovery apparatus for recovering a fading capacity of a battery, comprising:

the discharge control module is used for indicating the discharge device to discharge the battery to the lower limit of the corresponding battery parameter;

the battery recovery device is used for indicating the discharging device to discharge the battery to the corresponding battery parameter lower limit under the condition that the initial battery charge state of the battery is lower than a preset threshold;

the parameter lower limit determining module is used for determining the corresponding battery parameter lower limit according to the generating process and the current-voltage relation of the recoverable attenuation capacity and the percentage of the recoverable attenuation capacity of the battery needing to be recovered, wherein the generating process of the recoverable attenuation capacity is the battery charge state cycle interval and time for generating the recoverable attenuation capacity, and the current-voltage relation is a voltage change curve or a voltage capacity differential change curve under a constant current condition.

13. The apparatus for recovering restorable fading capacity of a battery according to claim 12, wherein the apparatus for recovering restorable fading capacity of a battery is configured to perform an operation of implementing the method for recovering restorable fading capacity of a battery according to any one of claims 1 to 11.

14. A recovery apparatus for recovering a fading capacity of a battery, comprising:

a memory to store instructions;

a processor configured to execute the instructions to cause the battery recoverable attenuation capacity recovery apparatus to perform operations that implement the method of recovering a battery recoverable attenuation capacity according to any of claims 1 to 11.

15. A battery management system comprising a recovery apparatus that can recover a fading capacity of a battery according to any one of claims 12 to 14.

16. A recovery system of recoverable attenuation capacity of a battery, comprising a recovery device of recoverable attenuation capacity of a battery according to any of claims 12 to 14, or comprising a battery management system according to claim 15.